The Timbuktu, Djenne, and Gao civilizations flourished as intermediate trade centers between the forest zone to the south, and the desert regions of North Africa and Egypt. The most important items of trade were:
A) oil and coal
B) salt and gold
C) spices
D) slaves
A
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To estimate the future value of a resource, the World Bank and most businesses use _____.
A. a 20% annual gain in value B. a 10% annual discount rate C. a 10% annual increase D. a 20% annual decrease E. complicated calculations based upon the specific resource
The European human population has grown more in the last 2,000 years than in the previous 400,000 years
Indicate whether this statement is true or false.
Characteristic of intensive subsistence agriculture is the great amount of ________ required for attaining high yields
A) labor B) fertilizers C) land D) both labor and land E) both land and fertilizers
What were pterosaurs? What adaptations did they have for their unique ability? What will be an ideal response?